393981887894 has 8 divisors (see below), whose sum is σ = 675397522128. Its totient is φ = 168849380520.

The previous prime is 393981887881. The next prime is 393981887927. The reversal of 393981887894 is 498788189393.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14070781697 + ... + 14070781724.

It is an arithmetic number, because the mean of its divisors is an integer number (84424690266).

Almost surely, 2^393981887894 is an apocalyptic number.

393981887894 is a deficient number, since it is larger than the sum of its proper divisors (281415634234).

393981887894 is a wasteful number, since it uses less digits than its factorization.

393981887894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28141563430.

The product of its digits is 752467968, while the sum is 77.

The spelling of 393981887894 in words is "three hundred ninety-three billion, nine hundred eighty-one million, eight hundred eighty-seven thousand, eight hundred ninety-four".